Harry has tough assignments but he is equal to the tasks. Neville has easy assignments but he isn't equal to much except gardening.

But I still don't count Neville out. I think the destruction of Voldemort will be a team effort. Just like Gryffindor winning the House Cup, it could be someone like Neville whose 10 points puts the good guys over the top. It could be the magic Stinkypunks that Neville grows that ultimately sets Voldemort up for a fall.